<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" v-model="isAll">
    <label for="toggle-all"></label>
    <!-- 按下enter键，将输入的任务传递给父组件，然后清空任务 -->
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model="task"
      @keydown.enter="keydownFn"
    />
  </header>
</template>

<script>
export default {
 props: ['list'],
 methods: {
  keydownFn(){
    this.$emit('addTask', this.task)
    this.task=''
  }
 },
 data () {
  return {
    task:'',
  }
 },
 computed: {
  isAll:{
    set(val){
      return this.list.forEach(item => item.isDone=val)
    },get(){
      return this.list.every(item=>item.isDone)
    }
  }
 }
}
</script>